Speaking to TheFIX two weeks after the grand finale -- where they declared their love for each other and decided to split $50,000 prize money after falling in love while living in a Villa in Mallorca -- Tayla, 21, confirmed that trust issues had led to the breakdown of their relationship.

"Obviously I'm heartbroken, it was a big shock to the system," Tayla said, revealing that it was her call to end the relationship and that she decided on Wednesday night. "I still respect him as a person and I just think he's young and he's made a massively bad decision, and didn't really think of the consequences that maybe a girl would have fallen in love with him, which just happened to be me. Hopefully that's something he learned through this experience and he learns how to play with people's emotions."

After days of speculation, Tayla confirmed that reports of Grant's "secret girlfriend", a woman named Lucy, meant she wasn't able to trust him. She decided she needed to end it and share the truth about their relationship status after constant questions about it, from media and from fans on her Instagram -- especially when "everyone has their opinion on what you should and shouldn't do."

The finale of 'Love Island Australia'. (Nine)

Tayla first learnt of Grant's girlfriend on the outside during a challenge in the Villa. "It came out that there were new accusations that Grant had a live-in girlfriend, and he's gone on the show to promote his business and get famous," she explained. "He denied it when we were in the house and I just had this gut feeling to follow through with it. Once I was able to access media and read the articles, I told Grant he needed to own up. I finally got the answer that was the truth: he was on there to promote himself and he did have a girlfriend who was running his business while he was inside the Villa."

"I said there was nothing more than I wanted for this to work, and to gain my trust back, but I gave him multiple chances inside the Villa, and obviously once I found out this information as well, the lies just continued the last 10 days. There was no trust being built up with anything. I couldn't be in a relationship with someone I don't trust."

Tayla tried to reach out to Lucy "because I wanna hear her side of the story, and because I felt she deserved to have that closure." But she didn't want to speak to Tayla, only to Grant. "He has told me he's broken up with her now, but has also told me he hasn't spoken to her since being out of the house," Tayla added. "Either way, I'm being lied to, or I look at him in that way."

She doesn't regret splitting the $50,000 prize money with him "because at the time I was in love and I wanted to share that with the person I was in love with."